Noise reduction filter



The appearance of the design for a noise reduction filter, characterized by a circular body, end caps with attached mounting brackets, and a pair of audio connector cables protruding from each end of the body.

FIG. 1 is a left front perspective view of a noise reduction filter, showing our new design;

FIG. 2 is a top plan view of FIG. 1;

FIG. 3 is a left side elevation of FIG. 1;

FIG. 4 is a right side elevation of FIG. 1;

FIG. 5 is a front elevation of FIG. 1;

FIG. 6 is a rear elevation of FIG. 1; and,

FIG. 7 is a bottom plan view of FIG. 1. 

The ornamental design for a noise reduction filter, as shown and described. 